Not much rhyme or reason in these charts, so I will go out on a limb here and guess they are dropping charges on people in the Magic Negro's Super-Secret Database marked "useful".

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Cook County State’s Attorney Kim Foxx is dropping felony cases involving charges of murder and other serious offenses at a higher rate than her predecessor, according to a Tribune analysis that comes amid a growing debate over criminal justice reform.

During Foxx’s first three years as the county’s top prosecutor, her office dropped all charges against 29.9% of felony defendants, a dramatic increase over her predecessor, the Tribune found. For the last three years of Anita Alvarez’s tenure, the rate was 19.4%.

In all, a total of 25,183 people had their felony cases dismissed under Foxx through November 2019, up from 18,694 for a similar period under Alvarez.

Foxx, a Democrat, swept into the state’s attorney’s office in 2016 vowing to reform the criminal justice system and reduce the population of Cook County Jail, which disproportionately holds low-income people of color. She is up for reelection in November.

In an interview, Foxx did not dispute the Tribune’s findings but said her office’s higher rate of dropped felony cases gives an incomplete picture of her commitment to keeping the public safe. She said her office has dismissed cases against low-level, nonviolent offenders so prosecutors can concentrate on crimes of violence.

“It is always eye-opening to be able to look at our own data and compare it to my predecessor’s past,” Foxx said. “I can’t reconcile what her decision-making was, and how they chose to (dismiss) cases in the past. But I will say that this administration has been clear that our focus would be on violent crime and making sure that our resources and attention would go to addressing violent crime.”

More:

https://www.chicagotribune.com/investigations/ct-kim-foxx-felony-charges-cook-county-20200810-ldvrmqvv6bd3hpsuqha4duehmu-story.html